Pen stand



FIG. 1 is a perspective view of a pen stand showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is another perspective view thereof.

The broken lines in the drawings is included for the purpose of showingportions of the pen stand that form no part of the claimed design.

CLAIM The ornamental design for a pen stand, as shown and described.